By K. Németh (auth.), K. Németh (eds.)

The Symposium used to be geared up via the Hungarian Ministry of Agriculture and the significant study Institute for Chemistry of the Hungarian Academy of Sciences. This laborious job was once coordinated by means of Dr. Varju to whom I desire to show my appreciation for his whole-hearted assistance. After the Symposium the individuals had the chance to go to the vineyards and cellars of the 'Balatonboglar' nation maintaining which proved of significant curiosity. the 1st foreign EUF Symposium owes its good fortune to the wonderful cooperation among the Biintehof Agricultural learn Station and the Hungarian Ministry of Agriculture, together with the valuable examine Institute for Chemistry of the Hungarian Academy of Sciences. the target of the Symposium used to be to provide the 1st effects and adventure won with the EUF strategy, in order that the papers brought are just a survey of the present-day country of information. the majority of the paintings of modifying, together with the choice of the articles, fell on Prof. Dr. van Diest, Wageningen, for whose helpful suggestion and untiring efforts I desire to checklist my detailed thank you. the various papers offered on the Symposium have already been released in different places and they're going to now not seem during this issue.

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Additional info for Application of Electro-Ultrafiltration (EUF) in Agricultural Production: Proceedings of the First International Symposium on the Application of Electro-Ultrafiltration in Agricultural Production, organized by the Hungarian Ministry of Agriculture and the

Example text

S =D- +Dd (5) Equation (1) describes the desorption rate as a function of d. The first derivative of (4) then yields an expression for the desorption rate as a function of time. K-DESORPTION IN AN EXTERNAL ELECTRIC FIELD 51 Table 2. 4 V/cm Soil No. II III IV V VI VII VIII IX Exch. K (Ileq. g- I) D (Ileq. 0 dd dt Dt O. 5 (t + t o . 5 )2 (6) Desorbed quantity and desorption rate may serve to characterize the ability of a soil to supply a nutrient when it exists in a soil in adsorbed form, such as K and P.

8%. The highest divergence of an individual analytical volume from the mean value varied in the entire Table 2. The amounts and th~ indexes of reproducibility of anode extracts. Mean value (x), coefficient of variation (CV) and the highest deviation of an individual volume of extract from the mean (L) Extraction classes in minutes 1. 0rup 3. 0rja 0-5 5-10 10-15 15-20 20-25 25-30 30-35 5. S. Ugglarp CV L 6. 3%. 4%. The rates of P desorption and their reproducibilities in six soils are given in Table 3.

2 --~~--~-- REPRODUCIBILITY OF EUF METHOD 41 Another important question is whether it is sufficient to determine anions only in the anode extract and cations only in the cathode extract. We have found that a large portion of the cations may in some cases collect in the anode extract and anions in the cathode extract, especially at the start of the extraction. Table 5 illustrates this situation with the distribution of K ions over the anode and cathode extracts. During the first five minutes of EUF extraction of the Fjardingslov soil almost half of the desorbed K entered the anode extract.

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